Type-writing machine.



J. P. MOBIRNEY.

TYPE WRITING MACHINE.

APPLIUATION FILED ooT.21,19o9.

984,284. Patented Feb. 14, 1911.

P-LI

IUNITED STATES PATENT OFFICE.

JAMES F. MCBIRNEY, 0F

HARTFORD, CONNECTICUT, ASSIGNOR TO ROYAL TYPEWRITER COMPANY, OF NEWYORK, N. Y., A CORPORATION 0F NEW JERSEY.

TYPE-WRITING MACHINE.

Specification of Letters Patent.

Patented Feb. 14, 1911.

Application filed October 21, 1909. Serial No. 523,847. i

T o all whom it may concern:

Be it known that I, JAMES F. MCBIRNEY, a citizen of the United States ofAmerica, residing in Hartford, county of Hartford, and State ofConnecticut, have invented certain Improvements in Type-IritingMachines, of which the following is a specification.

yThis invention relates to means for locking the shifting platen orcarriage in a typewriti'ng machine in lower case p'osition andsupporting it in upper case position, both functions being performed bya pivoted latch.

The invention is -an improvement.- upon the construction disclosed inLetters Patent to Edward B. Hess, No. 858,179 dated June 25, 1907. As inthat patent, the invention is shown applied to the Royal Standardniachine manufactured by the Royal Typewriter Company.

In the accompanying drawings: Figure l is a longitudinal section showingthe carriage in vnormal or lower ease position; and Fig'. 2,- a likeview showing it in elevated or upper case position.

The latch 1 that engages the bracket on a downward,extension 3 otI theshifting carriage has a hook d that locks the carriage in lowermostposition. The means for shifting the carriages-i. e. links 4, 5,-operatcfirst to withdraw the latch and to then elevate the carriage asexplained in the ahovc mentioned patent. In the present inven tion, thelatch performs the further function of supporting or locking thecarriage in ele- 'vated position and to this end it is formed with arearwardly extending projection 1" which as the carriage is liftedpasses under the bracket 2 and supports the carriage in elevatedposition. Since means of adjusting this latch may be desirable undersome conditions provision for adjustment iS made atits pivot. This maybe effected satisfactorily and conveniently by providing an eccentricadjustable pivot bolt (5. The mode of operation of the latch is clearlyapparent from the drawing and further description 1s unnecessary.

I claim:

1. In a typewriting machine, the combination of a shifting platenyframe, a pivoted latch engaging it for locking it in lowermost positionand also for supporting it in uppermost position, means for disengagingthe latch to permit the platen to rise, for shifting the platen and forrengagin the latch to support lthe platen in shifte position. i

2. In a typewriting machine, the combination of a shifting platen frame,an adjustable latch engaging it for locking it in lowermost position andalso `for supporting it. in uppermost position, means for disengagingthe latch to permit the platen to rise, for shifting the platen and forrengaging the latch to support the platen in shifted position. l

3. In a typewriting machine, the combination of a shifting platen frame,a latch having an eccentric adjustable ivot and engaging the platenframe for loc zing it in lowermost position and also forsupporting it inuppermost position, means for disengaging the latch to permit the platento rise, for shifting the platen and for rengaging the latch to supportthe platen in shifted position.

In testilnony whereof I have hereunto subscribed my name.

JAMES F. MCBIRNEY.

Witnesses:

FREDRICK HINE VAN ANSDALL, GEORGE HENKE.

